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The Unifix Grade 10.9 Socket Csk Head Screws are heavy-duty fasteners designed for mechanical and structural professionals who require high tensile strength and a flush finish. These M12 x 70 screws are ideal for demanding environments where secure fastening is critical, though users should ensure their tools are compatible with the specific internal hex drive size before beginning installation.
| Colour | Silver |
|---|---|
| Model Part Number | 1261115 |
| Brand | Unifix |
Grade 10.9 refers to the strength property class of the steel, indicating a high tensile strength suitable for heavy-duty applications.
DIN 7991 is a specific German industrial standard for hexagonal socket countersunk head screws, ensuring uniformity in dimensions and head angle.
They feature a bright zinc-plated finish which offers good corrosion resistance, but they are not rust-proof and should be protected in extremely harsh environments.
These require an Allen key or hex bit that corresponds to the socket size of the M12 screw.
Each pack contains 50 screws.
Verify that the hole has been properly countersunk to the correct angle required by the DIN 7991 standard.
Check that the hex key is fully seated in the socket and the thread pitch matches the tapped hole or nut.
To install these screws, ensure you have a precision-fit hex key to avoid cam-out. If installing into wood or metal, use a countersink drill bit to create the correct angle for the head to sit flush. For long-term performance, keep the fasteners dry and in their original packaging to prevent oxidation. If using in harsh conditions, consider applying a light layer of machine oil to the threads to further improve corrosion resistance over time.
